

/*  第一页 的 元素基本样式 */
.book #page1 .elem1_1 {
    width: 2rem;
    height: 3.3rem;
    bottom: 10rem;
    left: 0.5rem;
    background-image: url(../../img/pn/building1.png);
}

.book #page1 .elem1_2 {
    width: 6rem;
    height: 6.6rem;
    right: -3rem;
    bottom: 8.15rem;
    background-image: url(../../img/pn/building2.png);
}

/* 打开的时候 ，添加动画*/
.unfold#page1 .elem1_2 {
    -webkit-animation: mountFold ease 3s forwards;
    animation: mountFold ease 3s forwards;
}

/* 关起来的时候，添加另一个动画 */
.pre#page1 .elem1_2 {
    -webkit-animation: mountUnfold ease 3s forwards;
    animation: mountUnfold ease 3s forwards;
}

.book #page1 .elem1r_1 {
    width: 4rem;
    height: 4.4rem;
    bottom: 5.65rem;
    left: 1.8rem;
}

.book #page1 .elem1r_1 i {
    position: absolute;
    bottom: 0;
    width: 1.1rem;
    display: block;
    background-image: url(../../img/pn/launchingtower.png);
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

.book #page1 .elem1r_1::after {
    position: absolute;
    content: "";
    width: 0.25rem;
    height: 0.2rem;
    background: #6AC4F8;
    border-radius: 100%;
    top: -0.35rem;
    right: 0.4rem;
}

.book #page1 .elem1r_1 i:after {
    position: absolute;
    content: "";
    width: 1.25rem;
    height: 1rem;
    border: 1px solid #999;
    border-radius: 100%;
    opacity: 0;
    -webkit-animation: none;
    animation: none;
}

.book #page1.unfold .elem1r_1 i::after {
    -webkit-animation: launching linear 2s infinite;
    animation: launching linear 2s infinite;
}

.book #page1 .elem1r_1 i:nth-child(1) {
    height: 3.7rem;
    left: 0;
}

.book #page1 .elem1r_1 i:nth-child(2) {
    height: 2.8rem;
    left: 36%;
}

.book #page1 .elem1r_1 i:nth-child(3) {
    height: 4.4rem;
    right: 0;
}

.book #page1 .elem1r_1 i:nth-child(1):after {
    top: -1.5rem;
    right: -3rem;
    animation-delay: .2s;
}

.book #page1 .elem1r_1 i:nth-child(2):after {
    top: -2.4rem;
    right: -1.55rem;
    animation-delay: .4s;
}

.book #page1 .elem1r_1 i:nth-child(3):after {
    top: -0.8rem;
    right: -0.1rem;
    animation-delay: .6s;
}

.book #page1.unfold .elem1r_1 i:nth-child(1):after {
    animation-delay: .2s;
}

.book #page1.unfold .elem1r_1 i:nth-child(2):after {
    animation-delay: .4s;
}

.book #page1.unfold .elem1r_1 i:nth-child(3):after {
    animation-delay: .6s;
}